package com.ithaipeng.redanttakeaway.controller;

import com.ithaipeng.redanttakeaway.tools.Result;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.multipart.MultipartFile;

import javax.servlet.ServletOutputStream;
import javax.servlet.http.HttpServletResponse;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.UUID;

@RestController
@RequestMapping("/common")
public class CommonController {
    @Value("${reggie.path}")
    private String pathName;
    @PostMapping("/upload")
    public Result<String> upload(MultipartFile file){
        //先获取图片名字
        String originalFilename = file.getOriginalFilename();
        String substring = originalFilename.substring(originalFilename.lastIndexOf("."));
        //使用UUID来生存随机名字
        String fileName = UUID.randomUUID().toString() + substring;
        //创建一个目录对象
        File dir=new File(pathName);
        if(!dir.exists()){
            dir.mkdirs();
        }
        try {
            file.transferTo(new File(pathName+fileName));
        } catch (IOException e) {
            throw new RuntimeException(e);
        }
        return Result.success(fileName);
    }
    @GetMapping("/download")
    //响应
    public void download(String name, HttpServletResponse response){
        try {
            FileInputStream fileInputStream=new FileInputStream(new File(pathName+name));
            ServletOutputStream outputStream = response.getOutputStream();
            response.setContentType("image/jpeg");
            int len=0;
            byte[] bytes=new byte[1024];
            while ((len= fileInputStream.read(bytes))!=-1){
                outputStream.write(bytes,0,len);
                outputStream.flush();
            }
            outputStream.close();
            fileInputStream.close();
        } catch (Exception e) {
            throw new RuntimeException(e);
        }
    }
}
